How to aggregate Time effort from Task/Story/Bug into Epic?

[Aleksandar Ilijevski]

Hello,

I got a request from one of the users if I can aggregate Time effort from Task/Story/Bug into Epic. I have tried several solutions like:

https://www.scriptrunnerhq.com/help/example-scripts/sum-custom-field-related-epic-issues-cloud

or 

https://www.youtube.com/watch?v=CX5haGHkf0c (I have adjusted it slightly to the DC variant of Jira automation)

but non of these solutions work.
Do you see any impedence that this will not work or do you have some advice how to achieve this?

The time aggregation is working from subtasks to Task/Story/Bug, but above that level I can't make it work.

Thanks in advance!